کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333874 979112 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Large aspect ratio titanate nanowire prepared by monodispersed titania submicron sphere via simple wet-chemical reactions
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Large aspect ratio titanate nanowire prepared by monodispersed titania submicron sphere via simple wet-chemical reactions
چکیده انگلیسی

A facile one-step hydrothermal reaction among monodispersed titania submicron spheres and KOH solution was found to result in potassium titanate nanowires with a large aspect ratio. The diameter of these nanowires falls in the range of 50–200 nm and the length ranges from several micrometers to several tens of micrometers. It is found that the reaction temperature, duration, titanium source and the size distribution of titania raw powders have a great impact on the resultant morphology. Monodispersed TiO2 submicron sphere is beneficail for the formation and growth of large-area lamellar potassium titanate and consequently it is in favor of the production of nanowires with a large aspect ratio. The nanowires were analyzed by a range of methods including powder X-ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectrometer (EDX) and UV/Vis spectrophotometer. UV-absorption study showed that these nanowires are wide-band semiconductors with a band gap 3.4 eV. A formation mechanism is proposed on the basis of the dissolving, growth, thickening and splitting of K2Ti6O13 nanointermediates.

Monodispersed raw titania powders are beneficial to get the long and uniform K2Ti6O13 nanowires with a large aspect ratio. A formation mechanism of nanowires is proposed based on the dissolving, growth, thickening and splitting of K2Ti6O13 nanointermediates.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 180, Issue 3, March 2007, Pages 1028–1037
نویسندگان
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